Originally Posted by Steve Goldstein
For example, if that Copal 1 f/6.8 is for a 210 Geronar (Caltar II-E), I have a set so they'll be right on. If it's for a 210 Angulon, they won't be exact but are probably close enough.
Why won't they be the same for the same focal length?
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.